--- a/wp/wp-trackback.php	Mon Jun 08 16:11:51 2015 +0000
+++ b/wp/wp-trackback.php	Tue Jun 09 03:35:32 2015 +0200
@@ -20,9 +20,9 @@
  *
  * @since 0.71
  *
- * @param int|bool $error         Whether there was an error.
- *                                Default '0'. Accepts '0' or '1'.
- * @param string   $error_message Error message if an error occurred.
+ * @param mixed  $error         Whether there was an error.
+ *                              Default '0'. Accepts '0' or '1', true or false.
+ * @param string $error_message Error message if an error occurred.
  */
 function trackback_response($error = 0, $error_message = '') {
 	header('Content-Type: text/xml; charset=' . get_option('blog_charset') );